Compare the2024 Audi A4VS 2023 Honda Civic Si

Safety
Warranty
Reliability
Engine
Fuel Economy and Range
Transmission
Brakes and Stopping
Tires and Wheels
Suspension and Handling
Cargo Capacity
Servicing Ease
Ergonomics
Recommendations

Safety

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The A4’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The Civic Si doesn’t offer pre-crash pretensioners.

Both the A4 and Civic Si have child safety locks to prevent children from opening the rear doors. The A4 has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The Civic Si’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.

The A4 has a standard Audi Backguard System, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the Audi Backguard System moves the headrests forward to prevent neck and spine injuries. At the same time the pretensioning seatbelts fire, removing slack from the belts. The Civic Si doesn’t offer a whiplash protection system.

The A4 has a standard Secondary Collision Brake Assist, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The Civic Si doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.

The A4 has all-wheel drive to maximize traction under poor conditions, especially in ice and snow. The Civic Si doesn’t offer all-wheel drive.

When descending a steep, off-road slope, the A4’s standard Hill Descent Control allows you to creep down safely. The Civic Si doesn’t offer Hill Descent Control.

The A4 Premium Plus/Prestige has a standard Top and Corner View Cameras to allow the driver to see objects all around the vehicle on a screen. The Civic Si only offers a rear monitor.

Both the A4 and Civic Si offer rear cross-traffic warning, but the A4 with Rear Cross-Traffic Assist also has Automatic Brake Activation (automatically applies the brakes) to better prevent a collision when backing near traffic. The Civic Si’s Cross Traffic Monitor doesn’t automatically brake.

The A4 has a standard Audi Connect CARE, which uses a global positioning satellite (GPS) receiver and a cellular system to help track down your vehicle if it’s stolen or send emergency personnel to the scene if any airbags deploy. The Civic Si doesn’t offer a GPS response system, so if you’re involved in an accident and you’re incapacitated help may not come as quickly.

Both the A4 and the Civic Si have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, height adjustable front shoulder belts, plastic fuel tanks, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, rearview cameras and available blind spot warning systems.

The Audi A4 weighs 465 to 675 pounds more than the Honda Civic Si. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts. Crosswinds also affect lighter cars more.

The National Highway Traffic Safety Administration does 35 MPH front crash tests on new vehicles. In this test, results indicate that the Audi A4 is safer than the Honda Civic Si:

	A4	Civic Si
	Passenger
STARS	4 Stars	4 Stars
HIC	236	444
Neck Injury Risk	25%	25%
Neck Stress	119 lbs.	189 lbs.
Neck Compression	47 lbs.	61 lbs.

New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.

The National Highway Traffic Safety Administration does side impact tests on new vehicles. In this test, which crashes the vehicle into a flat barrier at 38.5 MPH and into a post at 20 MPH, results indicate that the Audi A4 is safer than the Honda Civic Si:

	A4	Civic Si
	Front Seat
STARS	5 Stars	5 Stars
HIC	172	195
Abdominal Force	219 lbs.	286 lbs.
	Rear Seat
STARS	5 Stars	5 Stars
Spine Acceleration	56 G’s	79 G’s
	Into Pole
STARS	5 Stars	5 Stars
Spine Acceleration	47 G’s	51 G’s
Hip Force	666 lbs.	805 lbs.

New test not comparable to pre-2011 test results. More stars = Better. Lower test results = Better.

Warranty

The A4 comes with a full 4-year/50,000-mile basic warranty, which covers the entire car and includes 24-hour roadside assistance. The Civic Si’s 3-year/36,000-mile basic warranty expires 1 year or 14,000 miles sooner.

The A4’s corrosion warranty is 7 years longer than the Civic Si’s (12 vs. 5 years).

Reliability

The Audi A4’s engines use a cast iron block for durability, while the Civic Si’s engine uses an aluminum block. Aluminum engine blocks are much more prone to warp and crack at high temperatures than cast iron.

Engine

The A4 40 TFSI’s standard 2.0 turbo 4-cylinder hybrid produces 1 more horsepower (201 vs. 200) and 44 lbs.-ft. more torque (236 vs. 192) than the Civic Si’s 1.5 turbo 4-cylinder. The A4 45 TFSI’s standard 2.0 turbo 4-cylinder hybrid produces 61 more horsepower (261 vs. 200) and 81 lbs.-ft. more torque (273 vs. 192) than the Civic Si’s 1.5 turbo 4-cylinder.

Fuel Economy and Range

In heavy traffic or at stoplights the A4’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. If the conditions warrant or the driver wishes, the system can be manually disabled at any time for the duration of a trip. The Civic Si doesn’t offer an automatic engine start/stop system.

The A4 has 2.9 gallons more fuel capacity than the Civic Si (15.3 vs. 12.4 gallons), for longer range between fill-ups.

Transmission

The A4 has a standard automatic transmission, for driver comfort, especially in the city. The Civic Si doesn’t offer an automatic transmission.

The A4 offers a standard sequential manual gearbox (SMG). With no clutch pedal to worry about and a fully automatic mode, an SMG is much more efficient than a conventional automatic but just as easy to drive. The Civic Si doesn’t offer an SMG.

The A4’s launch control uses engine electronics to hold engine RPM’s precisely in order to provide the most stable and rapid acceleration possible, using all of the available traction. The Civic Si doesn’t offer launch control.

Brakes and Stopping

For better stopping power the A4 45 TFSI’s brake rotors are larger than those on the Civic Si:

	A4 40 TFSI	A4 45 TFSI	Civic Si
Front Rotors	12.4 inches	13.3 inches	12.3 inches
Rear Rotors	11.8 inches	13 inches	11.1 inches

The A4’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs on the Civic Si are solid, not vented.

The A4 stops much shorter than the Civic Si:

	A4	Civic Si
70 to 0 MPH	149 feet	160 feet	Car and Driver
60 to 0 MPH	105 feet	110 feet	Motor Trend
60 to 0 MPH (Wet)	145 feet	147 feet	Consumer Reports

Tires and Wheels

For better traction, the A4’s optional tires are larger than the largest tires available on the Civic Si (245/40R18 vs. 235/40R18).

The A4’s optional tires provide better handling because they have a lower 35 series profile (height to width ratio) that provides a stiffer sidewall than the Civic Si’s 40 series tires.

For better ride, handling and brake cooling the A4 offers optional 19-inch wheels. The Civic Si’s largest wheels are only 18-inches.

The A4 has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the Civic Si; it requires you to depend on roadside assistance and your vehicle will have to be towed.

Suspension and Handling

The A4 has standard front and rear gas-charged shocks for better control over choppy roads. The Civic Si’s suspension doesn’t offer gas-charged shocks.

For a smoother ride and more stable handling, the A4’s wheelbase is 3.3 inches longer than on the Civic Si (111 inches vs. 107.7 inches).

For better handling and stability, the track (width between the wheels) on the A4 is 1.4 inches wider in the front than on the Civic Si.

The A4’s front to rear weight distribution is more even (56% to 44%) than the Civic Si’s (60% to 40%). This gives the A4 more stable handling and braking.

The A4 Premium Plus handles at .97 G’s, while the Civic Si pulls only .94 G’s of cornering force in a Car and Driver skidpad test.

The A4 Premium Plus executes Motor Trend’s “Figure Eight” maneuver 1 seconds quicker than the Civic Si (25.3 seconds @ .74 average G’s vs. 26.3 seconds @ .67 average G’s).

Cargo Capacity

With its sedan body style, valet key, locking rear seatbacks and remote trunk release lockout, the A4 offers cargo security. The Civic Si’s non-lockable remote release defeats cargo security.

A standard locking glovebox (which can’t be accessed with the valet key) keeps your small valuables safer in the A4. The Civic Si doesn’t offer locking storage for small valuables.

To make loading groceries and cargo easier when your hands are full, the A4’s available trunk can be opened just by kicking your foot under the back bumper, leaving your hands completely free. The Civic Si doesn’t offer a hands-free gesture to open its trunk, forcing you to put cargo down if your hands are full.

Servicing Ease

The A4 uses gas struts to support the hood for easier service access. The Civic Si uses a prop rod to support its heavy hood. It takes two hands to open the hood and set the prop rod, the prop rod gets in the way during maintenance and service, and the prop rod could be knocked out, causing the heavy hood to fall on the person maintaining or servicing the car.

The engine in the A4 is mounted longitudinally (North-South), instead of sideways, as in the Civic Si. This makes it easier to service and maintain, because the accessory belts are in front.

J.D. Power and Associates surveys of service recipients show that Audi service is better than Honda. J.D. Power ranks Audi 8th in service department satisfaction (above the industry average). With a 30% lower rating, Honda is ranked 25th.

Ergonomics

The A4 45 TFSI has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The Civic Si doesn’t offer a remote starting system.

When two different drivers share the A4, the optional memory seats and mirrors make it convenient for both. Each setting activates different, customized memories for the driver’s seat position and outside mirror angle. The Civic Si doesn’t offer a memory system.

The A4 Prestige has a standard heads-up display that projects speed, warning and navigation instruction readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The Civic Si doesn’t offer a heads-up display.

The power windows standard on both the A4 and the Civic Si have locks to prevent small children from operating them. When the lock on the A4 is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The Civic Si prevents the driver from operating the other windows just as it does the other passengers.

The A4’s front and rear power windows all open or close fully with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside the car. The Civic Si’s rear power window switches have to be held the entire time to open or close them fully.

If the windows are left open on the A4 the driver can close them all at the outside door handle or from a distance using the remote. On a hot day the driver can lower the windows from a distance using the keyless remote. The driver of the Civic Si can only close the windows from inside the vehicle, with the ignition on.

The A4’s power window, power lock, power mirror and cruise control switches are lit from behind, making them plainly visible and easier to operate at night. The Civic Si’s passenger power window switches are unlit, making them difficult to find at night and operate safely.

The A4’s rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The Civic Si’s intermittent wipers change speed with vehicle speed, but can’t turn on and off or change speed based on changing rainfall.

Heated windshield washer nozzles are standard on the A4 to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The Civic Si doesn’t offer heated windshield washer nozzles.

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The A4 Prestige has standard headlight washers to keep headlight output high. The Civic Si doesn’t offer headlight washers.

To help drivers avoid possible obstacles, the A4 has standard cornering lights to illuminate around corners when the turn signals are activated. The Civic Si doesn’t offer cornering lights.

Manual rear side window sunshades are available in the A4 to help block heat and glare for the rear passengers. The Civic Si doesn’t offer rear side window sunshades.

When the A4 with available tilt-down mirrors is put in reverse, the passenger rearview mirror tilts from its original position. This gives the driver a better view of the curb during parallel parking maneuvers. Shifting out of reverse puts the mirror into its original position. The Civic Si’s mirror doesn’t automatically adjust for backing.

The A4’s standard rear view mirror and optional side view mirrors have an automatic dimming feature. These mirrors can be set to automatically darken quickly when headlights shine on them, keeping following vehicles from blinding or distracting the driver. The Civic Si doesn’t offer the luxury of automatic dimming mirrors.

The A4 has standard heated front and second row seats (second row heated seats on Prestige) extremely comfortable in the winter. Heated seats aren’t available in the Civic Si.

Optional air-conditioned seats in the A4 (except Premium) keep the driver and front passenger comfortable and take the sting out of hot seats in Summer. The Civic Si doesn’t offer air-conditioned seats.

On extremely cold winter days, the A4’s optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The Civic Si doesn’t offer a heated steering wheel.

The A4’s standard dual zone air conditioning allows the driver and front passenger to choose two completely different temperatures so people with different temperature preferences won’t have to compromise. This makes both the driver and front passenger as comfortable as possible. The Civic Si doesn’t offer dual zone air conditioning.

Both the A4 and the Civic Si offer rear vents. For greater rear passenger comfort, the A4 has standard rear air conditioning vents to keep rear occupants cool in summer or warm in winter. The Civic Si doesn’t offer rear air conditioning vents, only heat vents.

To direct the driver from any location to a given street address, a GPS navigation system is available on the A4 (except Premium). The A4’s navigation system also has a real-time traffic update feature that offers alternative routes to automatically bypass traffic problems. (Service not available in all areas.) The Civic Si doesn’t offer a navigation system.

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Audi A4 Premium Plus/Prestige has a standard wireless phone charging system (Qi) in the center console. The Civic Si doesn’t offer wireless personal charging.

The A4 Prestige’s Park Assist can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The Civic Si doesn’t offer an automated parking system.

Recommendations

Consumer Reports® recommends both the Audi A4 and the Honda Civic Si, based on reliability, safety and performance.